Duplicating machine



A. MARCHEV ET AL Y March 5, 14935.

DUPLICATING MACHINE Filed Oct. '7, 1953 Ifred f farc Patented Mar. 5, 1935 UNITED STATESl PATENT oFF ics DUPLICATING MACHINE Alfred Marchev and John W. Hernlund, La

Grange, Ill., assignors ,to

Ditto, Incorporated,

Chicago, Ill., a corporation of West Virginia Application October 7,

3 Claims.

This invention relates to duplicating machines and, more fastening the end of ceiving or shown the adapted for attachment to a spindle having a iiattened face with a slot therein.

Among the features of our invention is a clip which one which can be easily and cheaply made and is simple in construction and operation. Among the special features of the clip is that it can be easily and quickly attached to a spindle and is self-detaching as the band is un- Wound from the spindle when the end is reached.

Another feature of our invention is such a clipV which can be ma de out of a single piece of sheet fastened to the end of the band by clamping the latter between portions of the clip.

Other features and advantages of our invention will appear more fully as we proceed with our specification.

In that f orm of device embodying the features of our invention shown in the accompanying drawing- Figure l ing the end proved clip the line 2 of Fig. l;

is a top plan view of a spindle, showof a band attached thereto by our irn- Fig. 2 is a view taken as indicated by and Fig. 3 is a view similar to Fig. 2 showing the clip becoming detached from the spindle at winding of the completion of the unthe band.

As shown in the drawing, 20 indicates a cylindrical spindle for receiving or dispensing the gelatin band 21.

These parts are in common use in conventional duplicating machines of the hectograph detail in o 692,679, filed 'October 7,

type. The spindle 20 is described in ur copending application, Serial No. 1933. Simi1arly,22 and `23 may indicate conventional supporting or bearing members in such a supporting It is to be understood gelatin band, or band,

machine for rotatably the spindle 20.

.that in speaking of the We may refer only to the the ends of flexible supporting sheet commonly forming a part of such band upon which a tin is appli The spindle 20 for coating of gelaed.

the purpose of cooperating with the improved clip is provided with an elongated iiattened face ranged slot 25.

24 having a centrally ar- The face 24 is preferably centrally arranged on the spindle and may extend a distance spindle. O be varied.

is about su substantially han the length ofthe bviously, however, this distance may The width of the face as here Ashown iicient to subtend an angle of about 1933, Serial No. 692,680 (Cl. 242-74) 50 of the circumference of the spindle. Obviously, also, the width of this face may be varied. v

The clip is formed of a single piece of sheet metal bent to form the outer convex portion 26 adapted to lie on the flattened face 24 of the spindle. This portion is so curved or convexed and proportioned so that when the complete clip with the gelatin band attached thereto is placed on the flattened face 24, as shown in Figs. 2 and 10 3, the outer face of the portion 26 will form a substantial continuation of the outer surface of the spindle 20. By means of this construction, therefore, when the clip is in place, it will serve band 2l is wound `on the spindle, it will wind smoothly over the clip.

The clip is provided with an inwardly extending slanting tongue 27 adapted to enter the slot andl hook against and partly under one edge 20 25a thereofvwhen the band 21 is wound on the spindle. In the unwinding operation, however, when the end of the band is reached and the pull is somewhat away from the cylinder or spindle, as shown in Fig. 3,'this pull will readily disengage the tongue 27 from the slot 25 causing self-detachment of the clip from the spindle.

As here shown, the clip is formed of a single piece of sheet metal and the tongue 27 is formed with the double walls 28 and 29, the latter being 30 attached at its outer edge to one edge of the portion 26 by the sheet metal portion 30. The other Wall 28 of the tongue is extended in between the portions 26 and 30, as shown in Figs. 2 and 3 and as indicated by 31. 35

The band is attached to the clip by passing the same around the extreme edge 31a of the portion 31, thence backwardly and down into the tongue 27 between the walls 28 and 29.

It will be noted that the tongue 27 is substan- 40 tially straight as distinguished from the hooks usually provided to secure gelatin bands to spindles.

While we have shown and described certain embodiments of our invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed inthe appended claims, in which it is our intention toy claim all novelty inherent in our invention as broadly as permissible, in view of the prior art.

What we regard as new, and desire to secure by Letters Patent, is:

1. The combination with a exible band, of a to ll out the flattened face 24 so that when the 15 I clip attached to one end of said band, said clip comprising a single piece of sheet metal clamped upon a fold in said end of said band, and an integral tongue projecting laterally from the bodi7 portion of the clip, and clamped on said end adjacent said fold.

2. The combination with a flexible band, of a clip attached to one end of said band, said clip comprising a bodiT portion clamped on a fold in said end of said band, and a tongue projecting laterally from said body portion, and clamped on said end adjacent said fold.

3. The combination with a flexible band, of a clip attached to one end of said band, said clip comprising a piece or" sheet metal bent upon itself to form a tongue and to provide a portion disposed between two other portions of said sheet metal, said end of said band 'being folded around the rst mentioned portion of said sheet metal, and being clamped between said portions. 

